First log into Poweradmin and click on Add master zone:

In this example, I will use 18.21.22.0/24 so the zone name is: 22.21.18.in-addr.arpa

Click on the Add zone button then edit the new zone and add nameservers:

Go to RIPE NCC and add the domain:

Added successfully:

Note that it may take a few minutes for the propagation and you may get the following error if nameservers haven’t propagated yet:
Server is not authoritative for 22.21.18.in-addr.arpa. Learn More



